    $(function(){
        let $btn = $('input'),
      delay = 6,
      timer = null;

  $btn.val('同意('+delay+'s)');
    $btn.attr('disabled','disabled');

    timer = setInterval(()=>{
          $btn.val('同意('+ --delay +'s)');
          if (delay===0){
                  clearInterval(timer);
                        $btn.val('同意');
                              $btn.removeAttr('disabled');
                                  
          }
            
    },1000);


    $btn.click(()=>{
          alert('butten clicked!');
            
    });

    });
